Jeremiah 50:21

²¹ Go up against the land of double rebellion, against it, and against the inhabitants of visitation; waste and utterly destroy after them, saith Jehovah, and do according to all that I have commanded thee.

Spoiler

'A spoiler,' as in Jeremiah 48:32, signifies evil and its derivative falsity.

In Jeremiah 12:12, 'spoilers' signify evils and falsities, which cause good and truth to perish, or evils from a lack of truth.